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   1 /**
   2  * Copyright (c) 2010-2022 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.deconz.internal;
  14
  15 import java.util.Locale;
  16 import java.util.Map;
  17 import java.util.Set;
  18 import java.util.concurrent.ConcurrentHashMap;
  19
  20 import org.eclipse.jdt.annotation.NonNullByDefault;
  21 import org.eclipse.jdt.annotation.Nullable;
  22 import org.openhab.core.thing.Channel;
  23 import org.openhab.core.thing.ChannelUID;
  24 import org.openhab.core.thing.ThingUID;
  25 import org.openhab.core.thing.binding.BaseDynamicStateDescriptionProvider;
  26 import org.openhab.core.thing.events.ThingEventFactory;
  27 import org.openhab.core.thing.link.ItemChannelLinkRegistry;
  28 import org.openhab.core.thing.type.DynamicStateDescriptionProvider;
  29 import org.openhab.core.types.StateDescription;
  30 import org.openhab.core.types.StateDescriptionFragment;
  31 import org.osgi.service.component.annotations.Component;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 /**
  36  * Dynamic channel state description provider.
  37  * Overrides the state description for the controls, which receive its configuration in the runtime.
  38  *
  39  * @author Jan N. Klug - Initial contribution
  40  */
  41 @NonNullByDefault
  42 @Component(service = { DynamicStateDescriptionProvider.class, DeconzDynamicStateDescriptionProvider.class })
  43 public class DeconzDynamicStateDescriptionProvider extends BaseDynamicStateDescriptionProvider {
  44     private final Logger logger = LoggerFactory.getLogger(DeconzDynamicStateDescriptionProvider.class);
  45
  46     private final Map<ChannelUID, StateDescriptionFragment> stateDescriptionFragments = new ConcurrentHashMap<>();
  47
  48     /**
  49      * Set a state description for a channel. This description will be used when preparing the channel state by
  50      * the framework for presentation. A previous description, if existed, will be replaced.
  51      *
  52      * @param channelUID
  53      *            channel UID
  54      * @param stateDescriptionFragment
  55      *            state description for the channel
  56      */
  57     public void setDescriptionFragment(ChannelUID channelUID, StateDescriptionFragment stateDescriptionFragment) {
  58         StateDescriptionFragment oldStateDescriptionFragment = stateDescriptionFragments.get(channelUID);
  59         if (!stateDescriptionFragment.equals(oldStateDescriptionFragment)) {
  60             logger.trace("adding state description for channel {}", channelUID);
  61             stateDescriptionFragments.put(channelUID, stateDescriptionFragment);
  62             ItemChannelLinkRegistry itemChannelLinkRegistry = this.itemChannelLinkRegistry;
  63             postEvent(ThingEventFactory.createChannelDescriptionChangedEvent(channelUID,
  64                     itemChannelLinkRegistry != null ? itemChannelLinkRegistry.getLinkedItemNames(channelUID) : Set.of(),
  65                     stateDescriptionFragment, oldStateDescriptionFragment));
  66         }
  67     }
  68
  69     /**
  70      * remove all descriptions for a given thing
  71      *
  72      * @param thingUID the thing's UID
  73      */
  74     public void removeDescriptionsForThing(ThingUID thingUID) {
  75         logger.trace("removing state description for thing {}", thingUID);
  76         stateDescriptionFragments.entrySet().removeIf(entry -> entry.getKey().getThingUID().equals(thingUID));
  77     }
  78
  79     @Override
  80     public @Nullable StateDescription getStateDescription(Channel channel,
  81             @Nullable StateDescription originalStateDescription, @Nullable Locale locale) {
  82         StateDescriptionFragment stateDescriptionFragment = stateDescriptionFragments.get(channel.getUID());
  83         if (stateDescriptionFragment != null) {
  84             logger.trace("returning new stateDescription for {}", channel.getUID());
  85             return stateDescriptionFragment.toStateDescription();
  86         } else {
  87             return super.getStateDescription(channel, originalStateDescription, locale);
  88         }
  89     }
  90 }